The heat island effect is the tendency for urban areas to be warmer than surrounding rural areas due to heat absorbed and re-radiated by buildings, pavement, and reduced vegetation. Added heat from vehicles and HVAC systems can intensify the effect. This raises cooling demand, energy use, and health risks during heat waves.
/hiːt ˈaɪlənd ɪˈfɛkt/
The heat island effect is the tendency for urban areas to be warmer than surrounding rural areas due to heat absorbed and re-radiated by buildings, pavement, and reduced vegetation. Added heat from vehicles and HVAC systems can intensify the effect. This raises cooling demand, energy use, and health risks during heat waves.
Why does the heat island effect matter for HVAC?
It increases outdoor temperatures, which raises cooling load and energy costs.
Source: The Cooling Company
Green roofs, trees, and cool surfaces reduce urban heat.
Cities add shade trees, reflective roofs, and cool pavements to lower neighborhood temperatures and reduce AC demand.
Plant shade trees and use reflective roofing to cut heat gain and cooling costs.
“Plant shade trees and use reflective roofing to cut heat gain and cooling costs.”
Urban areas can be 5 C (9 F) or more warmer than nearby rural areas.
Does the heat island effect impact utility bills?
Yes. Higher outdoor temps make AC run longer and increase energy use.
Can landscaping reduce heat island effects?
Yes. Trees and green roofs provide shade and evapotranspiration cooling.
Do cool roofs really help?
Yes. Reflective roofs reduce heat absorption and lower indoor temps.
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